Reversible motor



June 15, 1948. R. F. JOHNSON REVERSIBLE IOTOR Filed Sept. 26, 1946 o m t o E .t e m W W I m Mm mw ble motor provided Patented June 15, 19 58 UNITED STATES PATENT OFFICE 2,443,459 REVERSIBLE MOTOR Robert F. Johnson,

Fort Wayne; Incl,

to Generknl Electric Company, a corporation of New Yor Application September 26, 1946, Serial No. 899,428 9 Claims. (Cl. 318-291) specification.

The drawing schematically illustrates a reversiwith an embodiment of my invention.

In the illustrated a rever ble motor a source of electric power supply In this conprovided for selectively.

the corresponding terexciting windings 9 and Hi to form two parallel sets of field exciting windings.

I1 connects selectively one of the interconnecting terminals H and I2 between the shunt and series windings and is adapted to energize by this connection one or the shunt field exciting windings I or 8 directly in shunt across the source of electrical power supply and also the series field exciting winding II or 8 of the corresponding parallel circuit in series with the armature for providing a resultant cumulative excitation to the pole pieces of the motor, as indicated by the relativel large arrows I Q and 20 or 2| and 22, respectively, and for energizing the field ex- 66 citing windings 0f the other parallel circuit to ly simple control obtainable through provide components of excitation of the same polarity to all of the pole pieces, as indicated by the relatively smaller arrows 23 and 24 or 25 and 26, respectively, thereby providing components of excitation of the same polarity to all of the pole pieces with substantially no resultant excitation therefrom to the motor. With such an arrangement, a, shunt field exciting winding on one of the pole pieces is connected in shunt across the source of electrical power supply, and a series field exciting winding on another pole piece of each pair of pole pieces is connected in series with the armature and arranged to provide a resultant cumulative excitation to the motor, while the series field exciting winding on the first pole piece and the shunt field exciting winding on the second pole pieces is connected in series circuit relation with each other for providing substantially equal and the same polarity components of excitation to each of the two pole pieces, thereby substantially neutralizing each other. Another feature of the arrangement of the field exciting windings which has been found to facilitate the provision of the desired components of excitation to this machine is the arrangement of all of the series field exciting windings to provide components of excitation which are cumulative to each other, and the arrangement of the shunt field exciting windings to provide opposing excitation to each other, as can be seen by the relationship of the arrows which indicate the direction of magnetic excitation provided by these field exciting windings under the various selective energizations thereof through the selective double pole switch i1. With this arrangement, the same magnitude of excitation is provided to the motor for both directions of rotation, thereby enabling the motor to develop substantially the same torque for either direction of rotation, with a relativea relatively simple double pole connecting switch and a particular field arrangement and connection.

While I have illustrated and described a particular embodiment of my invention, modifications thereof will occur to those skilled in the art. I desire it to be understood, therefore, that my invention is not to be limited to the particular arrangement disclosed, and I intend in the appended claims to cover all modifications which do not depart from the spirit and scope of my invention.

What I claim as new and desire to secure by Letters Patent of the United States is:

1. A reversible motor having an armature member and a field member with a pair of shunt field exciting windings arranged respectively on a pair of pole pieces, a pair of series field exciting windings arranged respectively on said pole pieces, and means for selectively connecting the shunt field exciting winding on one of said pole pieces in shunt across a source of electrical power supply and the series field exciting winding on the other of said pole pieces in series with said armature to provide respectively components of opposite polarity to said pole pieces providing a resultant cumulative excitation to said motor. said selective connecting means also being arranged to connect the other of said series field exciting windings and the other of said shunt field exciting windings in series circuit relation with each other and in shunt across said armature to provide substantially the same polarity components of excitation to said polepieces.

2. A reversible motor having an armature 1 6 piece of each pair of pole her and a field member with a pa r of shunt field exciting windings arranged respectively on a pair of pole pieces, a pair of series field exciting windings arranged respectively on said pole pieces, and means for selectively connecting the shunt field exciting winding on one of said pole pieces in shunt across a source of electrical power supply and the series field exciting winding on the other of said pole pieces in series with said armature to provide respectively components of opposite polarity to said pole pieces providing a resultant cumulative excitation to said motor, said selective connecting means connect the other of said series field exciting windings and the other of said shunt field exciting windings in series circuit relation with each other and in shunt across said armature to provide substantially the same polarity components of excitation to said pole pieces thereby providing substantially no resultant excitation by said latter shunt and series field exciting windings.

3. A reversible motor having an armature member and a field member with a pair of shunt field exciting windings arranged respectively on 25 a pair of pole pieces, a pair of series field exciting windings arranged respectively on said ole pieces, and means for selectively connecting one of said shunt field exciting windings in shunt across a source of electrical power supply and a series field exciting winding in series with said armature to provide respectively opposite polarity components to said pole pieces providing a resultant cumulative excitation to said motor, and said selective connecting means also'being arranged to connect the other of said series field exciting windings and the other of said shunt field exciting windings in series circuit relation with each other and in shunt across said armature to provide components of excitation of the same polarity to said pole pieces, said series field excitin windings being arranged to provide components of excitation cumulative to each other and said shunt field exciting windings being arranged to provide opposing components of excitation to each other.

4. A reversible motor having an armature memher and a field member with a pair of shunt field exciting windings arranged respectively on a pair of pole pieces, a pair of series field exciting windings arranged respectively on said pole pieces, means for selectively connecting said field exciting windings in sets to provide opposite resultant excitation to said motor for opposite directions of rotation thereof, said selective connecting means being arranged to connect one of said shunt field exciting windings in shunt across a source of electrical power supply and to connect a series field exciting winding in series with said armature to provide respectively opposite polarity components to said pole pieces providing a resultant cumulative excitation to said motor, said selective connecting means also being arranged to connect the other of said series field exciting windings and the other of said shunt field exciting windings in series circuit relation with each other and in shunt across said armature to provide substantially equal and the same polarity components of excitation to said pole pieces thereby providing substantially no resultant excitation by said latter shunt and series field exciting windings.

5. A reversible motor having an armature member and a field member with a pair of shunt field exciting windings arranged respectively on a pair of pole pieces, a pair of series field exciting 7 w ndings arranged respectively on said pole also being arranged to to connect the other of said series field exciting l0 ing adapted to energize one of said shunt field of excitation to said pole pieces, said shunt con- 15 sultant cumulative excitation to said pole pieces each other when energized through said selective pol pie s. a se s field e iti din on each connecting means. a of said pole pieces, means for connecting a tereach other and in shunt across said armature and 45 sultant excitations to said motor for opposite dito said one pole piece and said seri con e t d 5 circuit to provide components of excitation of the arranged to provide excitation of opposite polarm rity to said other pole piece h energized 9. A reversible motor having an armature and through said selective connecting means a field member with at least a pair of pole pieces the other corresponding terminals of said shunt 7o circuits, means for connecting one terminal of each of said two parallel circuits to one side of side of a source of electric power supply, means for a source of electric power supply, means for con- 75 connecting the other terminal of each of said two 7 parallel circuits formed by connected terminals and said shunt connected field exciting winding of said series field exciting windings in series with and the series field exciting winding on the same said armature, means for selectively connecting pole piece being arranged to provide excitation of the connection between said shunt and series field the same polarity and said series connected series exciting windings of said two parallel circuits to 5 field exciting winding and the shunt field exciting the other side of said source of electric power supwinding on the other pole piece being arranged to ply for selectively providing opposite resultant provide excitation of opposite polarity to said excitations to said motor for opposite directions other pole piece when energized through said seof rotation thereof, said selective connecting lective connecting means.

means being adapted to energize one of said shunt 10 ROBERT F. JOHNSON. field exciting windings in shunt across the source of electrical power supply and. the series field ex- I REFERENCES CITED citing Winding of the corresponding Parallel The following references are of record in the cult in series with said armature for providing m of th patent;

a, resultant cumulative excitation to said pole 15 pieces of said motor and for energizing the field UNITED STATES PATENTS exciting windings of the other parallel circuit to Number Name Date provide components of excitation of the same 1,070,647 Whittingham Aug. 19, 1913 polarity to all of said pole pieces with substantially 1,103,528 Morse July 14, 1914 no resultant excitation therefrom to said motor, 20 2,424,337 Snyder July 22, 1947 

